Apple is now allowing developers to test more iOS 9 features with an update to its beta distribution app TestFlight. The updated version enables developers to test faster, native watchOS 2 apps for Apple Watch, including newly gained access to more sensors and custom watch face complications. The update also lets developers test some iOS 9 features like App Thinning, which allows users to download larger chunks of apps as needed to preserve local storage, for the first time.

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Apple highlights the added support for iOS 9 app distribution in the latest version of its TestFlight app for iPhone, iPad, and iPod touch. Apple has also added app-specific notification support in the new TestFlight update:

What’s New in Version 1.2.0

This update adds support for testing upcoming iOS 9 features — including watchOS 2 apps and App Thinning.

Testers can now choose how to receive update notifications for each app they are testing. Also, watchOS 2 beta apps will install automatically when the “Automatic Downloads” setting is turned on in the Apple Watch app.

Minor stability and performance improvements.

Developers and testers can update to the latest version of TestFlight for iOS via the App Store. While the update adds support for iOS 9 features and watchOS 2 apps, testing is still be limited to smaller, internal groups and not external test groups yet. Both iOS 9 and watchOS 2 are due out for iPhone, iPad, iPod touch, and Apple Watch later this fall.

Update: Apple has sent developers an email which clarifies that today’s TestFlight update does not yet extend to support external test groups; developer testing has also produced in this conclusion.